Reverse beta is ratio of emitter current to base current in inverse-active region (collector-base junction forward biased and the emitter-base junction reverse biased).
So if transistor operates in forward-active region and you interchange collector and emitter connections, it'll probably operate in reverse-active region.
I've not seen reverse beta in specs. But this parameter can be used in model of BJT.
Yes, BR (reversed beta) is a parameter in the commonly used BJT SPICE model (based on Gummel-Poon), the default value is 1. The parameter plays a role in the description of saturated operation. Gummel